Here is official word from SnapNames.com posted on DnForum.com .

"As you are aware the SnapNames service was unavailable between last Thursday evening U.S. Pacific time and today.  Functionality has now been restored and important data, including transaction history, has been fully retained.

Note that auctions scheduled to close between July 4-7 will now close on Tuesday, July 8or later.  Please monitor any auctions accordingly.

I’m sorry about this — it took a lot of effort by a lot of people over the holiday weekend to make sure that the site was restored 100%.  If you have further questions please email our customer service group at support @ snapnames or email me direct at kjelh @ snapnames"

No word on what the technical issue was, but they are back up!